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3D modeling of phytoplankton seasonal variation and nutrient budget in a southern Mediterranean Lagoon

Béchir Béjaoui 1 Cosimo Solidoro 2 Ali Harzallah 3 Cristele Chevalier 4 Annie Chapelle 5 Noureddine Zaaboub 1 Lotfi Aleya 6
1 INSTM - Institut National des Sciences et Technologies de la Mer [Salammbô]
2 OGS - Istituto Nazionale di Geofisica e di Oceanografia Sperimentale
3 Natl Inst Marine Sci & Technol, Salammbo, Tunisia
4 MIO - Institut méditerranéen d'océanologie
5 Unité Dyneco, Laboratoire Pelagos
DYNECO - Dynamiques de l'Environnement Côtier, IFREMER - Institut Français de Recherche pour l'Exploitation de la Mer
6 LCE - Laboratoire Chrono-environnement - CNRS - UFC (UMR 6249)
Abstract : A 3D coupled physical-biogeochemical model is developed and applied to Bizerte Lagoon (Tunisia), in order to understand and quantitatively assess its hydrobiological functioning and nutrients budget. The biogeochemical module accounts for nitrogen and phosphorus and includes the water column and upper sediment layer. The simulations showed that water circulation and the seasonal patterns of nutrients, phytoplankton and dissolved oxygen were satisfactorily reproduced. Model results indicate that water circulation in the lagoon is driven mainly by tide and wind. Plankton primary production is co-limited by phosphorus and nitrogen, and is highest in the inner part of the lagoon, due to the combined effects of high water residence time and high nutrient inputs from the boundary. However, a sensitivity analysis highlights the importance of exchanges with the Mediterranean Sea in maintaining a high level of productivity. Intensive use of fertilizers in the catchment area has a significant effect on phytoplankton biomass increase.
Keywords : Coupled hydrodynamic biogeochemical model , Water budget , Nutrient budget, water quality, lagoon
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Journal articles
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https://hal-amu.archives-ouvertes.fr/hal-01621707
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Submitted on : Monday, October 23, 2017 - 5:21:52 PM
Last modification on : Friday, October 23, 2020 - 5:20:09 PM

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Béchir Béjaoui, Cosimo Solidoro, Ali Harzallah, Cristele Chevalier, Annie Chapelle, et al.. 3D modeling of phytoplankton seasonal variation and nutrient budget in a southern Mediterranean Lagoon. Marine Pollution Bulletin, Elsevier, 2017, 114 (2), pp.962 - 976. ⟨10.1016/j.marpolbul.2016.11.001⟩. ⟨hal-01621707⟩

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